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    • 8. 发明申请
    • SEPARATE I AND Q BASEBAND PREDISTORTION IN DIRECT CONVERSION TRANSMITTERS
    • 直接转换发射机中的分离I和Q基带预测
    • WO2011072309A1
    • 2011-06-16
    • PCT/US2011/021213
    • 2011-01-13
    • QUALCOMM INCORPORATEDVERMA, SumitCASSIA, MarcoBANISTER, Brian Clarke
    • VERMA, SumitCASSIA, MarcoBANISTER, Brian Clarke
    • H04L27/36
    • H04L27/367
    • In-Phase (I) and Quadrature (Q) signals passing from a modem into a direct conversion transmitter are predistorted separately from, and independently of, one another. The I signal is predistorted to compensate for nonlinearities in the baseband I path circuitry between the modem and the upconverter. The Q signal is predistorted to compensate for nonlinearities in the baseband Q path circuitry between the modem and the upconverter. By employing the separate I and Q path baseband predistortion method, 4FMOD power in the upconverted and amplified signal as supplied to the transmitter antenna is reduced or eliminated. In one example, the transmitter employs single sideband modulation in the 777-787 MHz Verizon Band 13 while transmitting 23 dBm in a single LTE RB without emitting more than -57dBm/6.25kHz 4FMOD power into a nearby 763-775 MHz public safety band that starts only two megahertz away from the lower bound of Band 13.
    • 从调制解调器传送到直接转换发射机的同相(I)和正交(Q)信号彼此独立地进行预失真。 I信号被预失真以补偿调制解调器和上变频器之间的基带I路径电路中的非线性。 Q信号被预失真以补偿调制解调器和上变频器之间的基带Q路径电路中的非线性。 通过采用单独的I和Q路径基带预失真方法,降低或消除了提供给发射机天线的上变频和放大信号中的4FMOD功率。 在一个示例中,发射机在777-787MHz Verizon Band 13中采用单边带调制,同时在单个LTE RB中传输23 dBm,而不会在附近的763-775 MHz公共安全频段发射超过-57dBm / 6.25kHz的4FMOD功率, 距离13号带的下限仅开始两兆。